zoukankan html css js c++ java
0330复利计算（修改版）

  1 package kxj;
  2 import java.util.Scanner;
  3 
  4 public class Fulijisuan {
  5      public static double p,i,f ;
  6      public static double n;
  7      
  8      //计算本金
  9     public static void Benjin(){
 10         //int n;
 11         //float f,i,p;
 12         boolean flag;
 13          Scanner scanner=new Scanner(System.in);
 14           System.out.println("请输入终值: ");
 15           f=scanner.nextDouble();
 16           System.out.println("请输入年利率: ");
 17           i=scanner.nextDouble();
 18           System.out.println("请输入年数: ");
 19           n=scanner.nextInt();
 20           if(n>=0)
 21           {
 22               if(i>=0&&i<=1)
 23               {
 24                  flag=true;
 25                  p=(float) (f*1/Math.pow(1+i, n));
 26               }
 27               else
 28               {
 29                   System.out.println("输入的年利率有错！");
 30                   flag=false;
 31                   
 32               }
 33           }
 34           else
 35           {
 36               System.out.println("输入的年数有错！");
 37               flag=false;
 38               
 39           }
 40           if(flag)
 41               System.out.println("本金为： "+(double)(Math.round(p*100)/100.0));
 42     
 43     }
 44     
 45     //计算本息和
 46     public static void Benxihe(){
 47          double sum1=0,sum2=0;
 48          boolean flag;
 49           Scanner scanner=new Scanner(System.in);
 50           System.out.println("请输入本金: ");
 51           p=scanner.nextDouble();
 52           System.out.println("请输入年利率: ");
 53           i=scanner.nextDouble();
 54           System.out.println("请输入年数: ");
 55           n=scanner.nextInt();
 56          if(n>=0)
 57           {
 58               if(i>=0&&i<=1)
 59               {
 60                   sum1=(float) (p*Math.pow(1+i, n));
 61                    sum2=p*(1+i*n);
 62                    flag=true;
 63                    
 64               }
 65               else
 66               {
 67                   System.out.println("输入的年利率有错！");
 68                   flag=false;
 69                   
 70               }
 71           }
 72           else
 73           {
 74               System.out.println("输入的年数有错！");
 75               flag=false;
 76               
 77           }
 78           if(flag)
 79           {
 80              System.out.println("复利的本息和为： "+(double)(Math.round(sum1*100)/100.0));
 81              System.out.println("单利的本息和为： "+(double)(Math.round(sum2*100)/100.0));
 82           }
 83     }
 84     
 85     //计算年数
 86     public static void Nianshu(){
 87         boolean flag;
 88           Scanner scanner=new Scanner(System.in);
 89           System.out.println("请输入本金: ");
 90           p=scanner.nextDouble();
 91           System.out.println("请输入终值: ");
 92           f=scanner.nextDouble();
 93           System.out.println("请输入年利率: ");
 94           i=scanner.nextDouble();
 95          if(i>=0&&i<=1)
 96          {
 97              n=Logarithm.log(f/p,1+i); 
 98              flag=true;
 99          }
100          else
101          {
102             System.out.println("输入的年利率有错！"); 
103             flag=false;
104 
105          }
106          if(flag)
107           System.out.println("需要存的年数为: "+Math.ceil(n));     
108     }
109     
110     //计算年利率
111     public static void Lilv(){
112         boolean flag;
113          Scanner scanner=new Scanner(System.in);
114           System.out.println("请输入本金: ");
115           p=scanner.nextDouble();
116           System.out.println("请输入终值: ");
117           f=scanner.nextDouble();
118           System.out.println("请输入年数: ");
119           n=scanner.nextInt();
120          if(n>=0)
121           {
122               i=Math.pow(f/p, 1.0/n)-1;
123               flag=true;
124           }
125           else
126           {
127               System.out.println("输入的年数有错！");
128               flag=false;
129               
130           }
131           if(flag)
132           System.out.println("年报酬率为： "+(double)(Math.round(i*1000)/1000.0));
133     }
134     
135     //计算本利之和连同年金投资后的总资产
136     public static void Nianjin(){
137         boolean flag;
138          Scanner scanner=new Scanner(System.in);
139           System.out.println("请输入每年定投资金: ");
140           p=scanner.nextDouble(); 
141           System.out.println("请输入年利率: ");
142           i=scanner.nextDouble();
143           System.out.println("请输入年数: ");
144           n=scanner.nextInt();
145          if(n>=0)
146           {
147               if(i>=0&&i<=1)
148               {
149                    f=p*(1+i)*(Math.pow(1+i,n)-1)/i;
150                    flag=true;
151                    
152               }
153               else
154               {
155                   System.out.println("输入的年利率有错！");
156                   flag=false;
157                   
158               }
159           }
160           else
161           {
162               System.out.println("输入的年数有错！");
163               flag=false;
164               
165           }
166           if(flag)
167           System.out.println("年资产总值为："+(double)(Math.round(f*100)/100.0));     
168     }
169     
170     //计算每月等额本息还款
171     public static void BenxiHuankuan(){
172         double f,i,p = 0;
173         int n;
174         boolean flag;
175          Scanner scanner=new Scanner(System.in);
176           System.out.println("请输入贷款金额: ");
177           f=scanner.nextDouble();
178           System.out.println("请输入年利率: ");
179           i=scanner.nextDouble();
180           System.out.println("请输入贷款年数: ");
181           n=scanner.nextInt();
182          if(n>=0)
183           {
184               if(i>=0&&i<=1)
185               {
186                    i=i/12;
187                    n=n*12;
188                    p=f*i*Math.pow(1+i, n)/(Math.pow(1+i, n)-1);
189                    flag=true;
190                    
191               }
192               else
193               {
194                   System.out.println("输入的年利率有错！");
195                   flag=false;
196                   
197               }
198           }
199           else
200           {
201               System.out.println("输入的年数有错！");
202               flag=false;
203               
204           }
205           if(flag)
206          System.out.println("每月等额本息还款为："+(double)(Math.round(p*10000)/10000.0));
207         
208     }
209  
210      public static void main(String[] args) {
211          int choice;
212          while(true){
213          System.out.println("		|***********************|");
214          System.out.println("		|  1. 求       本      金  	|");
215          System.out.println("		|  2. 求   本   息   和 	|");
216          System.out.println("		|  3. 求      年       数 	|");
217         System.out.println("		|  4. 求      利       率 	|");
218         System.out.println("		|  5. 求年资产总值	|");
219         System.out.println("		|  6. 求等额本息还款	|");    
220          System.out.println("		|  7. 退        出          	|");
221          System.out.println("		|***********************|");
222          Scanner scanner=new Scanner(System.in);
223          System.out.println("
请输入你的选择(1~7):  ");
224          choice=scanner.nextInt();
225          switch(choice){
226          case 1:
227              Benjin();
228              break;
229          case 2:
230              Benxihe();
231              break;
232          case 3:
233              Nianshu();
234              break;
235          case 4:
236              Lilv();
237              break;
238          case 5:
239              Nianjin();
240              break;
241          case 6:
242              BenxiHuankuan();
243              break;
244          case 7:
245              System.out.println("Thanks for using!");
246              System.exit(0);
247              break;
248              default:
249              {
250                  System.out.println("输入有误!");
251                  break;
252              }
253          }
254              }        
255          }
256      }
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原文地址：https://www.cnblogs.com/950525kxj/p/5339303.html